angle of clearance

angle of clearance

[′aŋ·gəl əv ′klir·əns]
(ordnance)
The angle between the line along which a gun or launcher is pointed at the target and the line along which the weapon must be pointed for a projectile or missile fired from it to clear any obstruction between the weapon and the target.
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References in periodicals archive ?
1 where area bounded by ABC points means zero angle of clearance in flank plane.